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MICE RF – TIARA and General Progress . Tim Stanley RAL 5 June 2013. RF Amplifiers - Testing. Aim: achieve 2 MW at Daresbury Lab before transfer of the TIARA system to RAL Previously achieved: Just over 1 MW achieved last Autumn. Current position:

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mice rf tiara and general progress

MICE RF – TIARA and General Progress

Tim Stanley RAL

5 June 2013

rf amplifiers testing
RF Amplifiers - Testing
  • Aim: achieve 2 MW at Daresbury Lab before transfer of the TIARA system to RAL
  • Previously achieved:

Just over 1 MW achieved last Autumn.

slide3

Current position:

    • False trips of protection circuit (crowbar) in PSU; limits supply voltage to RF amplifiers.
    • Diagnostic tests over the last few weeks.
    • Replacement with re-used crowbar device (thyratron) gave some improvement; further conditioning and+ trials to recommence tomorrow at Daresbury Lab
    • High-spec thyratron available from Strathclyde University (circuit mods required) might enable RF testing programme to resume up to 2 MW
slide4

Best long-term solution is probably to procure solid-state crowbar devices. (8-weeks delivery and dependent on budget).

RF testing:

Once crowbar issue is fixed, main task is to optimise tuning of the end-stage tube amplifier at/for high power; an iterative process.

tiara preparations for installation
TIARA Preparations for Installation
  • Draft drawings have been produced, TS and AN at DL tomorrow to discuss detail
  • Modifications to mezzanine floor have commenced
  • Safety Document generated by RF group and being ratified at RAL. TS to be appointed EMF Protection Advisor.
slide8

De-mineralised cooling water system defined and drawn; interface/control panel to be built, and tested on TIARA amplifier system at DL before installation in MICE hall at RAL.

  • Water supply, of sufficient spec for TIARA, is currently available in MICE hall.
slide9

a local water-monitoring and protection circuit is advisable for TIARA until the full control system is installed.

  • trigger-generation unit required for timing of RF pulses in absence of LLRF full control system.
slide10

On-site supply of electricity: No remedial work expected until 2017; this might not even incur interruption of supply

  • Compressed air for amplifiers: layout/routing yet to be finalised.
  • Pressurisation (nitrogen gas) of co-ax transmission-lines, to dummy-load, is not necessary for TIARA RF milestone.
procurement full system
Procurement – Full System
  • Substantial procurement of RF components through University of Mississippi
    • New Tetrode amplifier set delivered to University of Mississippi from Photonis.
    • 4 new tetrode valves ordered from Photonis
    • Loads on order from Altronics.
slide12

Distribution Network

    • RF 4” elbows delivered to U. Mississippi
    • Order placed for all other required co-ax components with Mega; numbering/ID system implemented and deliveries have commenced.
    • Orders for 2 additional capacitors for RF system 2 placed with GA.
    • Capacitor chargers ordered from Lambda
    • List of support equipment being prepared, including
      • Solid state replacement for crowbar.
      • RF test gear
      • SSPAs
    • Don Summers (and colleagues) working on procurement; latest update: components for tuner-system ordered ($150K)